Removing and Installing/Replacing Hydraulic Unit for DSC

34 51 527 - Removing and installing/replacing hydraulic unit for DSC (M54 / N62 / N52)





Necessary preliminary tasks:
- Before removing hydraulic unit, read out control unit fault memory and if necessary print out diagnostic trouble code.
- Read and comply with General Information Service and Repair.

After completing work: Bleed braking system Bleeding Brake System with DSC

Installation:
When replacing the control unit, carry out the following tasks with the DIS (Diagnosis and Information System):

- Vehicle coding (performed by the vehicle itself)
- Adjustment of steering angle sensor (performed by the vehicle itself)
- Adjustment of brake pressure sensor (performed by the vehicle itself)
- Adjustment of lateral acceleration sensors (performed by the vehicle itself)
- Mix-up check of brake lines
- Function check, hydraulic unit





Press clutch pedal down to floor and secure with pedal support.

Note:
The pedal support may only be released when the brake lines are reconnected.

This prevents brake fluid from emerging from the expansion tank and air from entering the system when the brake lines are opened.





Important!
Do not mix up brake pipes (mark if necessary).

Close off connection bores with plugs.





Disconnect plug connection (1).

Important!
Do not bend brake lines.

Unfasten brake lines (2).

Installation:
Tightening torque 34 32 1AZ 34 32 Brake Lines.

Release screw (3) and remove hydraulic unit.





When replacing hydraulic unit:

Release screws (1) and convert holder (2).